claude-md-budget

# CLAUDE.md budget Authority: CLAUDE.md Maintenance Practice 5 (the whole forensic record), `tests/test_claude_md_size.py`, `tests/test_claude_md_rotation.py`, `tests/test_key_files_split.py`, `tests/test_cli_env_split.py`; the Floor is `claude_md.max_chars` (`uv run python -m harness check claude_md.max_chars`). 1. **Measure sections by heading and sort by size BEFORE choosing** what to rotate; twice the answer was a section nobody suspected. 2. **A rotation is TWO edits**: the release moves out of Current State AND the "Older releases (X and earlier)" boundary moves; the rotation test fails naming both numbers. 3. **What is derivable leaves, what is not stays**: a description jcodemunch can answer live goes to `KEY-FILES.md` / `CLI-AND-ENV.md`; a prohibition, a constraint whose violation causes a defect, or a rationale stays. Adding a name to the split tests' rationale lists to buy budget is the thing the split exists to stop. 4. **Rotated text goes to `ISSUE-HISTORY.md` verbatim**; ask what lesson it earned and put that one line in Standing lessons. 5. **The target must be tracked**: `git check-ignore` the path before writing (`docs/*` is ignored; `docs/standard/`, `docs/harness/`, `docs/cicd/`, `docs/workflows/` are re-included). 6. Never raise the Floor to make room; never delete a warning-marked rule.